Cisco Introduction to Cisco Networking Technologies : 640-821 exam
- Exam Code: 640-821
- Exam Name: Introduction to Cisco Networking Technologies
- Updated: Oct 04, 2026
- Q & A: 91 Questions and Answers
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Cisco 640-821 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Network Media and Topologies | - Ethernet LAN technologies - WAN technologies overview |
| Network Management and Troubleshooting | - Basic troubleshooting techniques - Network monitoring basics |
| Cisco IOS and Device Operation | - Cisco IOS navigation and commands - Basic device configuration |
| Networking Fundamentals | - OSI and TCP/IP models - Network types and components |
| Switching Fundamentals | - LAN switching concepts - VLAN basics |
| IP Addressing and Routing Basics | - IPv4 addressing and subnetting - Basic routing concepts |
Cisco Introduction to Cisco Networking Technologies Sample Questions:
Question #1
Which statements accurately describe CDP? (Choose three.)
- A. CDP is a Cisco proprietary protocol.
- B. CDP is a datalink layer protocol.
- C. CDP can discover directly connected neighboring Cisco devices.
- D. CDP can discover Cisco devices that are not directly connected.
- E. CDP is a network layer protocol.
- F. CDP is an IEEE standard protocol.
Correct Answer: A,B,C 🗳️
Question #2
Which two statements describe the operation of the CSMA/CD access method? (Choose two.)
- A. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
- B. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
- C. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
- D. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
- E. After a collision, the station that detected the collision has first priority to resend the lost data.
- F. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
Correct Answer: A,D 🗳️
Question #3
The internetwork shown in the diagram is experiencing network delays. On the basis of the information provided in the exhibit, what is the problem?
- A. The connection between Switch1 and Switch2 should be half-duplex.
- B. The cable connecting Host A to Switch2 is too long.
- C. The server is on a different subnet than router interface Fa0/0.
- D. The cable between Router1 and Switch1 should be a crossover.
- E. The cable between Switch1 and Switch2 should be straight-through.
Correct Answer: B 🗳️
Question #4
A router receives a packet on interface 172.16.45.66/26. The source IP of the packet is
172.16.45.126/26 and the destination is 172.16.46.191/26. How will the router handle the packet?
- A. The destination is a broadcast address, so the router will not forward the packet.
- B. The destination is a network address, so the router will forward the packet.
- C. The destination is a host on the same subnet, so the router will forward the packet.
- D. The destination is a host on another subnet, so the router will not forward the packet.
Correct Answer: A 🗳️
Question #5
What is the difference between the Cisco router IOS commands show cdp neighbor detail and show cdp entry?
- A. The show cdp entry command shows neighbor information for specific neighbors only, while show cdp neighbor detail lists each neighbor with detailed output on each.
- B. The show cdp entry command shows neighbor information for all neighbors with one line of output for each, while show cdp neighbor detail lists each neighbor with detailed output on each.
- C. The show cdp neighbor detail command shows neighbor information for a single neighbor only, while show cdp entry displays detailed output on each neighbor known.
- D. The show cdp neighbor detail command shows all neighbor information, while show cdp entry displays only one line of output for each neighbor.
Correct Answer: A 🗳️
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